A furnace waste heat recovery system

Abstract

The utility model relates to the technical field of waste heat recovery, and in particular to a furnace waste heat recovery system, which is composed of a furnace, a heat exchange device and a drainage system; the drainage system can guide the hot air from the furnace to the heat exchange device, and the heat exchange device of the utility model is composed of a plurality of heat exchange structures, each of which has an air intake end and an exhaust end; the drainage system comprises an air pump, an air supply main pipe, an air supply branch pipe, a first control valve and a second control valve, and the drainage system controls the hot air to enter each heat exchange structure by starting or closing the first control valve and / or the second control valve and in a series air intake mode or a parallel air intake mode. The utility model can more fully recover waste heat in different modes.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a furnace waste heat recovery system. Background Art

[0002] A furnace is a device commonly used for melting metal materials in industrial activities. For example, in the production of copper rods, the copper material often needs to be fed into the furnace, and then fed into the extruder after melting, and then extruded and cooled to form copper rods. At present, for the sake of environmental protection and energy saving, the high-temperature tail gas generated during the operation of the furnace is generally recovered (such as a central furnace tail gas waste heat recovery system disclosed in the authorization announcement number CN216432542U), so as to avoid tail gas pollution to the environment, and at the same time recover the heat of the tail gas to avoid a large amount of heat loss.

[0003] The current waste heat recovery has limited recovery of thermal energy, and can only recover part of the thermal energy. Taking CN216432542U as an example, after the heat energy preheats the metal material (such as aluminum), it can actually continue to be sent to other equipment for heat exchange. However, most of the existing practices are direct discharge, so there is a problem of incomplete waste heat recovery.

[0004] At the same time, there is currently no heat exchange equipment that can match the step-by-step recovery of waste heat.

[0005] Therefore, there is a need to improve the above situation. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a furnace waste heat recovery system, aiming to solve the problems arising from the above-mentioned background technology.

[0007] The technical solution of the utility model is implemented as follows: a furnace waste heat recovery system, which is composed of a furnace, a heat exchange device and a drainage system;

[0008] The drainage system can guide the hot gas of the furnace to the heat exchange device, wherein the heat exchange device is composed of a plurality of heat exchange structures, each of which has an air inlet end and an air outlet end;

[0009] Wherein, the drainage system comprises:

[0010] An air pump is connected to the furnace through a draft pipe and draws out the hot air from the furnace;

[0011] An air supply main pipe connected to the output end of the air pump;

[0012] The gas supply branch pipe is connected in series with the gas supply main pipe and is respectively connected to the gas inlet end of each heat exchange structure;

[0013] The first control valve is installed on the gas supply branch pipe;

[0014] A connecting pipe is provided between the air inlet end and the air outlet end of adjacent heat exchange structures;

[0015] A second control valve is installed on the connecting pipe;

[0016] Wherein, the second control valve has at least one inlet and two outlets, the inlet of the second control valve is connected to the exhaust end of the heat exchange structure through a connecting pipe, and each outlet of the second control valve is respectively connected to an exhaust pipe and an intake pipe connected to the intake end of the heat exchange structure;

[0017] The flow guiding system can control the hot gas to enter each heat exchange structure in a series intake mode or a parallel intake mode by starting or closing the first control valve and / or the second control valve.

[0018] By adopting the above technical solution:

[0019] The drainage system of the utility model is used in conjunction with a plurality of heat exchange structures, and can deliver hot air into the heat exchange structures in a series air intake mode or a parallel air intake mode;

[0020] When in the series air intake mode, the drainage system sends the hot air into each heat exchange structure in sequence until the heat in the hot air is completely recovered and then discharged, thereby ensuring the waste heat recovery effect. This mode is suitable for using waste heat in different scenarios, and these scenarios have different requirements for heat, so the series air intake mode is suitable.

[0021] In the parallel air intake mode, the drainage system delivers hot air to each heat exchange structure simultaneously. This mode retains the heat requirements of the prior art. For example, when preheating metal, a higher temperature is generally required. Therefore, in the following heat exchange structures in the series air intake mode, the thermal energy cannot meet the preheating requirements. Therefore, in this case, the parallel air intake mode can be used to ensure that the heat recovered from the waste heat in each heat exchange structure can meet the requirements.

[0022] Preferably, the heat exchange structure comprises:

[0023] A heat exchange body having a heat exchange cavity;

[0024] The air inlet and the air outlet are arranged on the heat exchange body and communicated with the heat exchange chamber;

[0025] The installation opening is distributed on the side wall of the heat exchange body and communicates with the heat exchange cavity;

[0026] The slide rail is composed of a first rail body and a second rail body which are arranged on the inner wall of the heat exchange chamber at intervals and distributed on both sides of each installation opening;

[0027] The heat exchange module is supported by the slide rail and can enter the heat exchange cavity from the installation port;

[0028] Among them, each heat exchange module is distributed in a stepped manner in the direction of hot gas flow.

[0029] By adopting the above technical solution:

[0030] The heat exchange modules in the heat exchange structure of the utility model are distributed in a stepped manner in the heat exchange chamber, so that they can be in contact with the hot air more fully, thereby improving the heat energy recovery effect.

[0031] At the same time, the stepped form allows the hot gas to contact each heat exchange module in a certain order, thus achieving the purpose of step-by-step recovery.

[0032] Preferably, the heat exchange module comprises:

[0033] Mounting plate;

[0034] The support plate is arranged on the mounting plate at intervals and has a slide groove adapted to the slide rail;

[0035] The heat exchange tube is slidably connected to the support plate through the bracket;

[0036] Wherein, an air inlet joint and an air outlet joint are provided on the mounting plate, and the air inlet joint and the air outlet joint are connected to the air inlet end and the air outlet end of the heat exchange tube through a telescopic tube arranged on the mounting plate.

[0037] Preferably, the telescopic tube comprises:

[0038] The outer tube is fixedly arranged on the mounting plate and communicated with the air inlet connector or the air outlet connector;

[0039] The inner tube is coaxially arranged with the outer tube and can slide relative to the outer tube.

[0040] Preferably, the mounting plate is provided with an adjustment structure, and the adjustment structure comprises:

[0041] A movable plate connected to the telescopic tube;

[0042] The cylinder is fixedly arranged on the mounting plate, and the piston shaft of the cylinder is connected with the moving plate.

[0043] Preferably, the mounting plate comprises:

[0044] Mainboard, adapted to the mounting port;

[0045] Limiting plate;

[0046] A support column is arranged on a side of the limiting plate close to the heat exchange body;

[0047] A sealing gasket is arranged on a side of the limiting plate close to the heat exchange body;

[0048] A first threaded hole is formed on the limiting plate;

[0049] Wherein, a limiting area which is engaged with the limiting plate is provided around the installation opening, and a supporting cavity for the supporting column to enter is recessed on the side wall of the limiting area.

[0050] Preferably, the heat exchange body is provided with a fixing structure, and the fixing structure comprises:

[0051] The L-shaped plate is rotatably connected to the heat exchange body via a rotating shaft;

[0052] a second threaded hole formed on the L-shaped plate;

[0053] Wherein, a fixing bolt matched with the first threaded hole is arranged in the second threaded hole.

[0054] By adopting the above technical solution:

[0055] The heat exchange tubes in the heat exchange module of the utility model can be controlled to move in the heat exchange chamber. When the heat exchange tubes move, the heat exchange tubes can be distributed in a stepped manner. Moreover, during the heat exchange process, when the heat exchange effect of each heat exchange tube is poor, the position of the heat exchange tube can be adjusted in time on the extrusion without disassembling the heat exchange module, so that it can better absorb the heat energy in the heat exchange chamber.

[0056] In addition, other advantages of the present invention will be demonstrated in the embodiments of the present invention, thereby making the beneficial effects of the present invention more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0058] Figure 1 This is a schematic diagram of the structure of a specific embodiment 1 of the utility model;

[0059] Figure 2 This is a schematic diagram of the heat exchange structure in the specific embodiment 2 of the present utility model;

[0060] Figure 3 It is a cross-sectional view of the heat exchange structure in the specific embodiment 2 of the present utility model;

[0061] Figure 4 for Figure 3 BB section view in;

[0062] Figure 5 for Figure 4 CC section view in;

[0063] Figure 6 for Figure 4 A magnified view of part A in FIG.

[0064] Figure 7 This is a schematic diagram of external equipment that cooperates with the heat exchange structure in specific embodiment 2 of the utility model. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0066] Example 1

[0067] like Figure 1 As shown, the utility model discloses a furnace waste heat recovery system, which is composed of a furnace 10, a heat exchange device and a drainage system. The drainage system of this embodiment can guide the hot air of the furnace to the heat exchange device.

[0068] In this embodiment, the heat exchange device is composed of four heat exchange structures 20 , and each heat exchange structure 20 has an air inlet end 201 and an air outlet end 202 .

[0069] In this embodiment, the drainage system extracts the tail gas generated by the operation of the furnace through the drainage pipe 31 by means of the air pump 30 and sends it to the heat exchange device.

[0070] In this embodiment, the output end of the air pump 30 is connected to the air supply main pipe 32, and the other end of the air supply main pipe 32 is connected in series with air supply branch pipes 33 matching the number of heat exchange structures, and each air supply branch pipe 33 is connected to the air inlet end 201 of each heat exchange structure 20.

[0071] In this embodiment, a connecting pipe 35 is further connected between the air inlet end 201 and the air outlet end 202 of the adjacent heat exchange structures 20 .

[0072] In this embodiment, a first control valve 34 and a second control valve 36 are further included. The first control valve 34 is installed on the gas supply branch pipe 33; the second control valve 36 is installed on the connecting pipe 35, wherein the second control valve 36 has at least one inlet and two outlets, the inlet of the second control valve 36 is connected to the exhaust end 202 of the heat exchange structure 20 through the connecting pipe 35, and each outlet of the second control valve 36 is respectively connected to the exhaust pipe 37 and the intake pipe 38 connected to the intake end 201 of the heat exchange structure 20;

[0073] The flow guiding system can control the hot gas to enter each heat exchange structure by starting or closing the first control valve 34 and / or the second control valve 36 and in a series intake mode or a parallel intake mode.

[0074] In this embodiment, each heat exchange structure 20 is further provided with a heat exchange tube 20 a.

[0075] refer to Figure 1 , the principle of this embodiment is:

[0076] In the series air intake mode, open the first control valve at the bottom, close the other three first control valves, and adjust the second control valves to connect the adjacent heat exchange structures. The air pump can send the hot air into the bottom heat exchange structure and exchange heat with the heat exchange tube inside it. After the exchange is completed, it enters the next heat exchange structure. Similarly, after completing the heat exchange in the last heat exchange structure, it is discharged through the exhaust end of the heat exchange structure to complete the heat exchange work.

[0077] In the above mode, heat energy is absorbed step by step by each heat exchange structure, thereby improving the heat energy recovery effect. In this embodiment, the heat energy recovered by different heat exchange structures has different uses. For example, the heat energy recovered by the first heat exchange structure can be used to preheat metal, while the heat energy recovered by the last heat exchange structure can be used to heat water in the factory. Therefore, this embodiment can better recover heat energy by recovering it step by step.

[0078] In the parallel air intake mode, the first control valve is opened, and the second control valve is adjusted to connect the exhaust end of the heat exchange structure with the exhaust pipe, so that the hot air can be sent to each heat exchange structure at the same time. This situation retains the temperature requirements of the prior art for preheating metal. When the company's output is high, the use of the parallel air intake mode can remove more waste heat from more metals to ensure production capacity.

[0079] Embodiment 2 is different from Embodiment 1 in that

[0080] like Figure 2-7 As shown, in this embodiment, the heat exchange structure 20 includes:

[0081] The heat exchange body 40 has a heat exchange chamber 40a;

[0082] The air inlet 41 and the air outlet 42 are provided on the heat exchange body 40 and communicate with the heat exchange chamber 40a;

[0083] The mounting opening 43 is distributed on the side wall of the heat exchange body 40 and communicates with the heat exchange cavity 40a;

[0084] The slide rail is composed of a first rail body 441 and a second rail body 442 which are arranged on the inner wall of the heat exchange chamber 40a at intervals and distributed on both sides of each installation opening 43;

[0085] The heat exchange module 45 is supported by the slide rail and can enter the heat exchange chamber 40a from the installation opening 43;

[0086] The heat exchange modules 45 are distributed in a stepped manner along the hot gas flow direction.

[0087] In this embodiment, the heat exchange module 45 includes:

[0088] Mounting plate 450;

[0089] The support plate 451 is spaced apart on the mounting plate 450 and has a slide groove 452 adapted to the slide rail;

[0090] The heat exchange tube 453 is slidably connected to the support plate 451 through a bracket;

[0091] The mounting plate 450 is provided with an air inlet connector 454 and an air outlet connector 455 , and the air inlet connector 454 and the air outlet connector 455 are connected to the air inlet end and the air outlet end of the heat exchange tube 453 through a telescopic tube provided on the mounting plate 450 .

[0092] In this embodiment, the telescopic tube includes:

[0093] The outer tube 50 is fixedly mounted on the mounting plate 450 and communicates with the air inlet connector 454 or the air outlet connector 455;

[0094] The inner tube 51 is disposed coaxially with the outer tube 50 and is slidably disposed relative to the outer tube 50 .

[0095] In this embodiment, the mounting plate is provided with an adjustment structure, and the adjustment structure includes:

[0096] The movable plate 60 is connected to the inner tube 51 of the telescopic tube;

[0097] The cylinder 61 is fixedly disposed on the mounting plate 450 , and a piston shaft 610 of the cylinder 61 is connected to the moving plate 60 .

[0098] In this embodiment, the mounting plate 450 includes:

[0099] Main board 4501, adapted to mounting opening 43;

[0100] Limiting plate 4502;

[0101] The support column 4503 is disposed on a side of the limiting plate 4502 close to the heat exchange body 40;

[0102] The sealing gasket 4504 is arranged on a side of the limiting plate 4502 close to the heat exchange body 40;

[0103] A first threaded hole 4505 is formed on the limiting plate 4502;

[0104] A limiting area 43a which is engaged with the limiting plate 4502 is disposed around the installation opening 43, and a supporting cavity 43b for the supporting column 4503 to enter is recessed on the side wall of the limiting area 43a.

[0105] In this embodiment, the heat exchange body 40 is provided with a fixing structure, and the fixing structure includes:

[0106] The L-shaped plate 70 is rotatably connected to the heat exchange body 40 via a rotating shaft 71;

[0107] A second threaded hole is formed on the L-shaped plate 70;

[0108] A fixing bolt 72 adapted to the first threaded hole 4505 is provided in the second threaded hole.

[0109] In this embodiment, the external device includes a container 70 , a container cavity 71 and a heat release pipe 71 .

[0110] refer to Figure 2-7 In the heat exchange structure of this embodiment, when exchanging heat, hot air enters the heat exchange cavity from the air inlet and exchanges heat with the heat exchange tube. When in use, the external device can be connected to the air outlet connector and the air inlet connector through the pipeline. Figure 7 The pump body introduces the gas into the heat exchange tube from the air inlet joint, and after heat exchange, sends it into the heat release tube from the air outlet joint, heats the container cavity and then discharges it from the other end of the heat release tube, completing the heat exchange work.

[0111] In this embodiment, reference Figure 3 The stepped shape of each heat exchange tube can make the heat exchange tube partially staggered, so that the heat of the hot air flowing from the air inlet to the exhaust port can be better absorbed.

[0112] Secondly, refer to Figure 4 and Figure 6 In order to adjust the position of the heat exchange tube, a cylinder is arranged on the mounting plate in this embodiment. The cylinder can control the movement of the movable plate and drive the heat exchange tube away from or close to the mounting plate through the inner tube, thereby adjusting the position of the heat exchange tube.

[0113] In addition, it should be noted that when installing the heat exchange module of this embodiment, the coordination between the limit plate and the limit area, and the coordination between the support cavity and the support column can make the heat exchange module more convenient to install (that is, it is easier to coordinate the slide rail and the slide groove). Moreover, in order to improve the sealing of the installation port, a sealing gasket is provided on the limit plate.

[0114] When disassembling, unscrew the fixing bolts, rotate the L-shaped plate to separate the limit plate, and take out the heat exchange module; when installing, first send the heat exchange module into the installation port, use the L-shaped plate to press the limit plate, and screw on the fixing bolts to complete the fixation.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A furnace waste heat recovery system, comprising a furnace (10), a heat exchange device and a drainage system; in, The drainage system can guide the hot air of the furnace (10) to the heat exchange device, and is characterized in that: the heat exchange device is composed of a plurality of heat exchange structures (20), and each heat exchange structure (20) has an air inlet end (201) and an exhaust end (202); Wherein, the drainage system comprises: An air pump (30) is connected to the furnace through a drainage pipe (31) and draws out hot air from the furnace (10); An air supply main pipe (32) connected to an output end of the air pump (30); The gas supply branch pipe (33) is connected in series with the gas supply main pipe (32) and is respectively connected to the gas inlet end (201) of each heat exchange structure (20); A first control valve (34) is installed on the gas supply branch pipe (33); A connecting pipe (35) is provided between an air inlet end (201) and an air outlet end (202) of adjacent heat exchange structures (20); A second control valve (36) installed on the connecting pipe (35); The second control valve (36) has at least one inlet and two outlets, the inlet of the second control valve (36) is connected to the exhaust end (202) of the heat exchange structure (20) through a connecting pipe (35), and each outlet of the second control valve (36) is respectively connected to an exhaust pipe (37) and an intake pipe (38) connected to the intake end (201) of the heat exchange structure (20); The flow guiding system can control the hot gas to enter each heat exchange structure (20) by starting or closing the first control valve (34) and / or the second control valve (36) in a series intake mode or a parallel intake mode.

2. A furnace waste heat recovery system according to claim 1, characterized in that: The heat exchange structure (20) comprises: A heat exchange body (40) having a heat exchange chamber (40a); An air inlet (41) and an air outlet (42) are provided on the heat exchange body (40) and are in communication with the heat exchange chamber (40a); The installation opening (43) is distributed on the side wall of the heat exchange body (40) and communicates with the heat exchange cavity (40a); The slide rail is composed of a first rail body (441) and a second rail body (442) which are arranged on the inner wall of the heat exchange chamber (40a) at intervals and distributed on both sides of each installation opening (43); The heat exchange module (45) is supported by the slide rail and can enter the heat exchange chamber (40a) from the installation opening (43); The heat exchange modules (45) are distributed in a stepped manner in the direction of hot gas flow.

3. A furnace waste heat recovery system according to claim 2, characterized in that: The heat exchange module (45) comprises: Mounting plate (450); A support plate (451) is arranged on the mounting plate (450) at intervals and has a slide groove (452) adapted to the slide rail; The heat exchange tube (453) is slidably connected to the support plate (451) via a bracket; The mounting plate (450) is provided with an air inlet joint (454) and an air outlet joint (455), and the air inlet joint (454) and the air outlet joint (455) are connected to the air inlet end and the air outlet end of the heat exchange tube (453) via a telescopic tube provided on the mounting plate (450).

4. A furnace waste heat recovery system according to claim 3, characterized in that: The telescopic tube comprises: The outer tube (50) is fixedly mounted on the mounting plate (450) and is in communication with the air inlet connector (454) or the air outlet connector (455); The inner tube (51) is coaxially arranged with the outer tube (50) and is slidably arranged relative to the outer tube (50).

5. A furnace waste heat recovery system according to claim 3 or 4, characterized in that: The mounting plate is provided with an adjustment structure, and the adjustment structure comprises: A movable plate (60) connected to the telescopic tube; The cylinder (61) is fixedly arranged on the mounting plate (450), and the piston shaft (610) of the cylinder (61) is connected to the moving plate (60).

6. A furnace waste heat recovery system according to claim 3 or 4, characterized in that: The mounting plate (450) comprises: A main board (4501) adapted to fit the mounting opening (43); Limiting plate (4502); A support column (4503) is arranged on a side of the limiting plate (4502) close to the heat exchange body (40); A sealing gasket (4504) is arranged on a side of the limiting plate (4502) close to the heat exchange body (40); A first threaded hole (4505) is formed on the limiting plate (4502); A limiting area (43a) which is engaged with the limiting plate (4502) is provided around the installation opening (43), and a supporting cavity (43b) for the supporting column (4503) to enter is recessed on the side wall of the limiting area (43a).

7. A furnace waste heat recovery system according to claim 6, characterized in that: The heat exchange body (40) is provided with a fixing structure, and the fixing structure comprises: An L-shaped plate (70) is rotatably connected to the heat exchange body (40) via a rotating shaft (71); A second threaded hole formed on the L-shaped plate (70); Wherein, a fixing bolt (72) adapted to the first threaded hole (4505) is provided in the second threaded hole.

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